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20121104
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-section, the frictional resistance is the minimum, so the water loses very little energy flowing over the channel. if it's a wide, flat channel, a fairly shallow river, there's a greater surface area along the banks and the bottom, and that slows the stream down, too. the texture of a stream bed also influences stream velocity. roughness is a function of the materials over which it flows, so if it's flowing over gravel and boulders, there's more resistance to the flow. that slows the river. if it's flowing over muds and clays, like along the lower mississippi river, there's less resistance, and it flows a little faster. the velocity of a river also tends to increase if the amount of water in the river channel increases. the quantity of water moving through a river is called its discharge. the discharge of a river is how much water it's actually carrying. we usually measure this as a volume per unit time. the united states commonly says cubic feet per second. most of the world uses cubic meters per second moving down the channel. discharge increases from the head of the stream to the stream mouth as the
were so high! great job! children need to run, and they need to work off that energy. but along with that, we provide challenges for them. for instance, i would hope in an appropriate preschool you would always see a climber... and a climber having stairs, a climber having maybe a chain that they will have to problem solve and figure out how to move on that. so even though they are running off energy, they're also outside problem-solving, figuring out ways to move their bodies on different objects to promote that development. hendrick: vigorous play is the breath of life to children. our young people need to climb... crawl... run... balance... and hang from equipment. what would you do? how would you use your environment? what sorts of activities and equipment would you suggest that would help your children maximize their playtime? we have...sometimes we involve dancing in our lesson plans. we have things like the balance beam out, and that stimulates their coordination and their sense of balance. um...even going outside and running. so far, we have looked at how to provide an a
and fabulous and water is really the new oil. water is extremely important to us. but also it gives us energy. we have hydropower from our water source, a lot of city, if not all of the city is powered, sfmta, possibly the city buildings is powered by the hetch hetchy and i don't want to give that up either. >> thank you. i will remind the candidates that if at any point they wish to jump in on a question they may do so using a time card. the next question is for miss breed, mr. johnson and miss selby. please explain whether you think sit/lie is working to address public safety as intended across the city and how you would reform it, if indeed you would reform it? miss breed? >> i did vote yes on sit/lie. i had a number of issues in the upper haight that were just really unfortunate situations and i thought there needed to be some sort of solution to the problem. unfortunately it hasn't worked. we still have some real problems in the haight and we need to make sure that the social service agencies that deal with mental health abuse issues, that deal with drug treatment issues, those particul
the energy per charge, we're talking about a concept called voltage. guess where the voltage will be higher, here or here? when i hold it like this, i'll have a voltage difference. when i hold it like this, i'll have-- the same. --no voltage difference. when i hold it like this, you saw a current. when i held it like this, you saw no current. i wonder if there's a reason for that. we're gonna talk about that next time. see you then. physics, yey. [music]
care about you, but they've never had this. and i go to the mailbox and i don't have the energy to walk out there. i couldn't sit back down, and i'm scared to move because i'm scared it'll happen again. so it's sort of a vicious cycle, and then you think, "well, here i am. i don't know what to do about this." my brother's a doctor and encouraged me to come to the emory cardiac rehab program. well, i didn't much want to but in february i did start. february of '92, i did come to the program. and the part of that that's so good is that they put a monitor on me and they start your exercises very slowly, you know, but you feel real secure. that's kind of like a security blanket-- the monitor. poa: i think the best thing for women to do nowadays is to understand their own risk factors, their family history, their own lifestyle, know... are they at greatly increased risk for heart disease? and modify the risk factors that have been proven with studies thus far. i just got off the treadmill. hamilton: yes, i changed a lot of things. i quit smoking. never touched another cigarette. they did hav
Search Results 0 to 4 of about 5